We know that height in humans is a polygenic trait because it has a lot of variation. The height gene is controlled by at minimum three genes with six different alleles. If all of these alleles are dominant for the tall gene you will be tall if you are dominant for the short gene you will be short if there is no clear dominance between the two genes you will fall somewhere in the middle.
Both Paramecium population decrease. However, one population is drastically reduced while the other persists. This is according to the competitive exclusion principle. Two populations that share the same niche and resource will compete and this will have a negative effect on both populations. However, the population with the slightest advantage over the other will eliminate the other from the environment over time.
A genotype is your genes themselves, the phenotype is the appearance of those genes The phenotype is what you see and the genotype is just all of your genes
Producing red and white blood cell
I would say that it resembles a dog, because none of the other ones really have "Jowls"